/*
 * FIPS 180-2 SHA-224/256/384/512 implementation
 *
 * Copyright (C) 2005-2023 Olivier Gay <olivier.gay@a3.epfl.ch>
 * https://github.com/ogay/sha2, BSD 3-Clause License
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "crypto/sha2.h"

#define SHFR(x, n) (x >> n)
#define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
#define ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
#define CH(x, y, z) ((x & y) ^ (~x & z))
#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))

#define SHA256_F1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
#define SHA256_F2(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
#define SHA256_F3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3))
#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))

#define SHA512_F1(x) (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
#define SHA512_F2(x) (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))
#define SHA512_F3(x) (ROTR(x, 1) ^ ROTR(x, 8) ^ SHFR(x, 7))
#define SHA512_F4(x) (ROTR(x, 19) ^ ROTR(x, 61) ^ SHFR(x, 6))

#define UNPACK32(x, str)                   \
    {                                      \
        *((str) + 3) = (uint8)((x));       \
        *((str) + 2) = (uint8)((x) >> 8);  \
        *((str) + 1) = (uint8)((x) >> 16); \
        *((str) + 0) = (uint8)((x) >> 24); \
    }

#define PACK32(str, x)                                                          \
    {                                                                           \
        *(x) = ((uint32) * ((str) + 3)) | ((uint32) * ((str) + 2) << 8) |       \
               ((uint32) * ((str) + 1) << 16) | ((uint32) * ((str) + 0) << 24); \
    }

#define UNPACK64(x, str)                   \
    {                                      \
        *((str) + 7) = (uint8)((x));       \
        *((str) + 6) = (uint8)((x) >> 8);  \
        *((str) + 5) = (uint8)((x) >> 16); \
        *((str) + 4) = (uint8)((x) >> 24); \
        *((str) + 3) = (uint8)((x) >> 32); \
        *((str) + 2) = (uint8)((x) >> 40); \
        *((str) + 1) = (uint8)((x) >> 48); \
        *((str) + 0) = (uint8)((x) >> 56); \
    }

#define PACK64(str, x)                                                           \
    {                                                                            \
        *(x) = ((uint64) * ((str) + 7)) | ((uint64) * ((str) + 6) << 8) |        \
               ((uint64) * ((str) + 5) << 16) | ((uint64) * ((str) + 4) << 24) | \
               ((uint64) * ((str) + 3) << 32) | ((uint64) * ((str) + 2) << 40) | \
               ((uint64) * ((str) + 1) << 48) | ((uint64) * ((str) + 0) << 56);  \
    }

/* Macros used for loops unrolling */

#define SHA256_SCR(i)                                                             \
    {                                                                             \
        w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + w[i - 16]; \
    }

#define SHA512_SCR(i)                                                             \
    {                                                                             \
        w[i] = SHA512_F4(w[i - 2]) + w[i - 7] + SHA512_F3(w[i - 15]) + w[i - 16]; \
    }

#define SHA256_EXP(a, b, c, d, e, f, g, h, j)                                         \
    {                                                                                 \
        t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) + sha256_k[j] + w[j]; \
        t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]);                             \
        wv[d] += t1;                                                                  \
        wv[h] = t1 + t2;                                                              \
    }

#define SHA512_EXP(a, b, c, d, e, f, g, h, j)                                         \
    {                                                                                 \
        t1 = wv[h] + SHA512_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) + sha512_k[j] + w[j]; \
        t2 = SHA512_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]);                             \
        wv[d] += t1;                                                                  \
        wv[h] = t1 + t2;                                                              \
    }

static const uint32 sha224_h0[8] = {0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939,
                                    0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4};

static const uint32 sha256_h0[8] = {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
                                    0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};

static const uint64 sha384_h0[8] = {
    0xcbbb9d5dc1059ed8ULL, 0x629a292a367cd507ULL, 0x9159015a3070dd17ULL, 0x152fecd8f70e5939ULL,
    0x67332667ffc00b31ULL, 0x8eb44a8768581511ULL, 0xdb0c2e0d64f98fa7ULL, 0x47b5481dbefa4fa4ULL};

static const uint64 sha512_h0[8] = {
    0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL, 0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
    0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL, 0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL};

static const uint32 sha256_k[64] = {
    0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
    0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
    0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
    0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
    0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
    0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
    0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
    0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};

static const uint64 sha512_k[80] = {
    0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
    0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
    0xd807aa98a3030242ULL, 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
    0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
    0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
    0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
    0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
    0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
    0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
    0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
    0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
    0xd192e819d6ef5218ULL, 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
    0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
    0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
    0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
    0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
    0xca273eceea26619cULL, 0xd186b8c721c0c207ULL, 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
    0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
    0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
    0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL};

/* SHA-2 internal function */

static void sha256_transf(sha256_ctx* ctx, const uint8* message, uint64 block_nb) {
    uint32 w[64];
    uint32 wv[8];
    uint32 t1, t2;
    const uint8* sub_block;
    uint64 i;

    for (i = 0; i < block_nb; i++) {
        sub_block = message + (i << 6);

        PACK32(&sub_block[0], &w[0]);
        PACK32(&sub_block[4], &w[1]);
        PACK32(&sub_block[8], &w[2]);
        PACK32(&sub_block[12], &w[3]);
        PACK32(&sub_block[16], &w[4]);
        PACK32(&sub_block[20], &w[5]);
        PACK32(&sub_block[24], &w[6]);
        PACK32(&sub_block[28], &w[7]);
        PACK32(&sub_block[32], &w[8]);
        PACK32(&sub_block[36], &w[9]);
        PACK32(&sub_block[40], &w[10]);
        PACK32(&sub_block[44], &w[11]);
        PACK32(&sub_block[48], &w[12]);
        PACK32(&sub_block[52], &w[13]);
        PACK32(&sub_block[56], &w[14]);
        PACK32(&sub_block[60], &w[15]);

        SHA256_SCR(16);
        SHA256_SCR(17);
        SHA256_SCR(18);
        SHA256_SCR(19);
        SHA256_SCR(20);
        SHA256_SCR(21);
        SHA256_SCR(22);
        SHA256_SCR(23);
        SHA256_SCR(24);
        SHA256_SCR(25);
        SHA256_SCR(26);
        SHA256_SCR(27);
        SHA256_SCR(28);
        SHA256_SCR(29);
        SHA256_SCR(30);
        SHA256_SCR(31);
        SHA256_SCR(32);
        SHA256_SCR(33);
        SHA256_SCR(34);
        SHA256_SCR(35);
        SHA256_SCR(36);
        SHA256_SCR(37);
        SHA256_SCR(38);
        SHA256_SCR(39);
        SHA256_SCR(40);
        SHA256_SCR(41);
        SHA256_SCR(42);
        SHA256_SCR(43);
        SHA256_SCR(44);
        SHA256_SCR(45);
        SHA256_SCR(46);
        SHA256_SCR(47);
        SHA256_SCR(48);
        SHA256_SCR(49);
        SHA256_SCR(50);
        SHA256_SCR(51);
        SHA256_SCR(52);
        SHA256_SCR(53);
        SHA256_SCR(54);
        SHA256_SCR(55);
        SHA256_SCR(56);
        SHA256_SCR(57);
        SHA256_SCR(58);
        SHA256_SCR(59);
        SHA256_SCR(60);
        SHA256_SCR(61);
        SHA256_SCR(62);
        SHA256_SCR(63);

        wv[0] = ctx->h[0];
        wv[1] = ctx->h[1];
        wv[2] = ctx->h[2];
        wv[3] = ctx->h[3];
        wv[4] = ctx->h[4];
        wv[5] = ctx->h[5];
        wv[6] = ctx->h[6];
        wv[7] = ctx->h[7];

        SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 0);
        SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 1);
        SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 2);
        SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 3);
        SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 4);
        SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 5);
        SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 6);
        SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 7);
        SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 8);
        SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 9);
        SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 10);
        SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 11);
        SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 12);
        SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 13);
        SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 14);
        SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 15);
        SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 16);
        SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 17);
        SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 18);
        SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 19);
        SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 20);
        SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 21);
        SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 22);
        SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 23);
        SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 24);
        SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 25);
        SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 26);
        SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 27);
        SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 28);
        SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 29);
        SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 30);
        SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 31);
        SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 32);
        SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 33);
        SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 34);
        SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 35);
        SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 36);
        SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 37);
        SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 38);
        SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 39);
        SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 40);
        SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 41);
        SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 42);
        SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 43);
        SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 44);
        SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 45);
        SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 46);
        SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 47);
        SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 48);
        SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 49);
        SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 50);
        SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 51);
        SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 52);
        SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 53);
        SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 54);
        SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 55);
        SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, 56);
        SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, 57);
        SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, 58);
        SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, 59);
        SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, 60);
        SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, 61);
        SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, 62);
        SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, 63);

        ctx->h[0] += wv[0];
        ctx->h[1] += wv[1];
        ctx->h[2] += wv[2];
        ctx->h[3] += wv[3];
        ctx->h[4] += wv[4];
        ctx->h[5] += wv[5];
        ctx->h[6] += wv[6];
        ctx->h[7] += wv[7];
    }
}

static void sha512_transf(sha512_ctx* ctx, const uint8* message, uint64 block_nb) {
    uint64 w[80];
    uint64 wv[8];
    uint64 t1, t2;
    const uint8* sub_block;
    uint64 i;
    int j;

    for (i = 0; i < block_nb; i++) {
        sub_block = message + (i << 7);

        PACK64(&sub_block[0], &w[0]);
        PACK64(&sub_block[8], &w[1]);
        PACK64(&sub_block[16], &w[2]);
        PACK64(&sub_block[24], &w[3]);
        PACK64(&sub_block[32], &w[4]);
        PACK64(&sub_block[40], &w[5]);
        PACK64(&sub_block[48], &w[6]);
        PACK64(&sub_block[56], &w[7]);
        PACK64(&sub_block[64], &w[8]);
        PACK64(&sub_block[72], &w[9]);
        PACK64(&sub_block[80], &w[10]);
        PACK64(&sub_block[88], &w[11]);
        PACK64(&sub_block[96], &w[12]);
        PACK64(&sub_block[104], &w[13]);
        PACK64(&sub_block[112], &w[14]);
        PACK64(&sub_block[120], &w[15]);

        SHA512_SCR(16);
        SHA512_SCR(17);
        SHA512_SCR(18);
        SHA512_SCR(19);
        SHA512_SCR(20);
        SHA512_SCR(21);
        SHA512_SCR(22);
        SHA512_SCR(23);
        SHA512_SCR(24);
        SHA512_SCR(25);
        SHA512_SCR(26);
        SHA512_SCR(27);
        SHA512_SCR(28);
        SHA512_SCR(29);
        SHA512_SCR(30);
        SHA512_SCR(31);
        SHA512_SCR(32);
        SHA512_SCR(33);
        SHA512_SCR(34);
        SHA512_SCR(35);
        SHA512_SCR(36);
        SHA512_SCR(37);
        SHA512_SCR(38);
        SHA512_SCR(39);
        SHA512_SCR(40);
        SHA512_SCR(41);
        SHA512_SCR(42);
        SHA512_SCR(43);
        SHA512_SCR(44);
        SHA512_SCR(45);
        SHA512_SCR(46);
        SHA512_SCR(47);
        SHA512_SCR(48);
        SHA512_SCR(49);
        SHA512_SCR(50);
        SHA512_SCR(51);
        SHA512_SCR(52);
        SHA512_SCR(53);
        SHA512_SCR(54);
        SHA512_SCR(55);
        SHA512_SCR(56);
        SHA512_SCR(57);
        SHA512_SCR(58);
        SHA512_SCR(59);
        SHA512_SCR(60);
        SHA512_SCR(61);
        SHA512_SCR(62);
        SHA512_SCR(63);
        SHA512_SCR(64);
        SHA512_SCR(65);
        SHA512_SCR(66);
        SHA512_SCR(67);
        SHA512_SCR(68);
        SHA512_SCR(69);
        SHA512_SCR(70);
        SHA512_SCR(71);
        SHA512_SCR(72);
        SHA512_SCR(73);
        SHA512_SCR(74);
        SHA512_SCR(75);
        SHA512_SCR(76);
        SHA512_SCR(77);
        SHA512_SCR(78);
        SHA512_SCR(79);

        wv[0] = ctx->h[0];
        wv[1] = ctx->h[1];
        wv[2] = ctx->h[2];
        wv[3] = ctx->h[3];
        wv[4] = ctx->h[4];
        wv[5] = ctx->h[5];
        wv[6] = ctx->h[6];
        wv[7] = ctx->h[7];

        j = 0;

        do {
            SHA512_EXP(0, 1, 2, 3, 4, 5, 6, 7, j);
            j++;
            SHA512_EXP(7, 0, 1, 2, 3, 4, 5, 6, j);
            j++;
            SHA512_EXP(6, 7, 0, 1, 2, 3, 4, 5, j);
            j++;
            SHA512_EXP(5, 6, 7, 0, 1, 2, 3, 4, j);
            j++;
            SHA512_EXP(4, 5, 6, 7, 0, 1, 2, 3, j);
            j++;
            SHA512_EXP(3, 4, 5, 6, 7, 0, 1, 2, j);
            j++;
            SHA512_EXP(2, 3, 4, 5, 6, 7, 0, 1, j);
            j++;
            SHA512_EXP(1, 2, 3, 4, 5, 6, 7, 0, j);
            j++;
        } while (j < 80);

        ctx->h[0] += wv[0];
        ctx->h[1] += wv[1];
        ctx->h[2] += wv[2];
        ctx->h[3] += wv[3];
        ctx->h[4] += wv[4];
        ctx->h[5] += wv[5];
        ctx->h[6] += wv[6];
        ctx->h[7] += wv[7];
    }
}

/* SHA-224 functions */

sha224_ctx* sha224_init(void) {
    sha224_ctx* ctx;
    ctx = malloc(sizeof(sha224_ctx));
    if (!ctx) {
        return 0;
    }

    ctx->h[0] = sha224_h0[0];
    ctx->h[1] = sha224_h0[1];
    ctx->h[2] = sha224_h0[2];
    ctx->h[3] = sha224_h0[3];
    ctx->h[4] = sha224_h0[4];
    ctx->h[5] = sha224_h0[5];
    ctx->h[6] = sha224_h0[6];
    ctx->h[7] = sha224_h0[7];

    ctx->len = 0;
    ctx->tot_len = 0;
    return ctx;
}

void sha224_update(sha224_ctx* ctx, const uint8* message, uint64 len) {
    uint64 block_nb;
    uint64 new_len, rem_len, tmp_len;
    const uint8* shifted_message;

    tmp_len = SHA224_BLOCK_SIZE - ctx->len;
    rem_len = len < tmp_len ? len : tmp_len;

    memcpy(&ctx->block[ctx->len], message, rem_len);

    if (ctx->len + len < SHA224_BLOCK_SIZE) {
        ctx->len += len;
        return;
    }

    new_len = len - rem_len;
    block_nb = new_len / SHA224_BLOCK_SIZE;

    shifted_message = message + rem_len;

    sha256_transf(ctx, ctx->block, 1);
    sha256_transf(ctx, shifted_message, block_nb);

    rem_len = new_len % SHA224_BLOCK_SIZE;

    memcpy(ctx->block, &shifted_message[block_nb << 6], rem_len);

    ctx->len = rem_len;
    ctx->tot_len += (block_nb + 1) << 6;
}

int sha224_final(sha224_ctx* ctx, uint8* digest) {
    uint64 block_nb;
    uint64 pm_len;
    uint64 len_b;
    uint64 tot_len;

    block_nb = (1 + ((SHA224_BLOCK_SIZE - 9) < (ctx->len % SHA224_BLOCK_SIZE)));

    tot_len = ctx->tot_len + ctx->len;
    ctx->tot_len = tot_len;

    len_b = tot_len << 3;
    pm_len = block_nb << 6;

    memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
    ctx->block[ctx->len] = 0x80;
    UNPACK64(len_b, ctx->block + pm_len - 8);

    sha256_transf(ctx, ctx->block, block_nb);

    UNPACK32(ctx->h[0], &digest[0]);
    UNPACK32(ctx->h[1], &digest[4]);
    UNPACK32(ctx->h[2], &digest[8]);
    UNPACK32(ctx->h[3], &digest[12]);
    UNPACK32(ctx->h[4], &digest[16]);
    UNPACK32(ctx->h[5], &digest[20]);
    UNPACK32(ctx->h[6], &digest[24]);

    free(ctx);
    return SHA224_DIGEST_SIZE;
}

/* SHA-256 functions */

sha256_ctx* sha256_init(void) {
    sha256_ctx* ctx;
    ctx = malloc(sizeof(sha256_ctx));
    if (!ctx) {
        return 0;
    }

    ctx->h[0] = sha256_h0[0];
    ctx->h[1] = sha256_h0[1];
    ctx->h[2] = sha256_h0[2];
    ctx->h[3] = sha256_h0[3];
    ctx->h[4] = sha256_h0[4];
    ctx->h[5] = sha256_h0[5];
    ctx->h[6] = sha256_h0[6];
    ctx->h[7] = sha256_h0[7];

    ctx->len = 0;
    ctx->tot_len = 0;
    return ctx;
}

void sha256_update(sha256_ctx* ctx, const uint8* message, uint64 len) {
    uint64 block_nb;
    uint64 new_len, rem_len, tmp_len;
    const uint8* shifted_message;

    tmp_len = SHA256_BLOCK_SIZE - ctx->len;
    rem_len = len < tmp_len ? len : tmp_len;

    memcpy(&ctx->block[ctx->len], message, rem_len);

    if (ctx->len + len < SHA256_BLOCK_SIZE) {
        ctx->len += len;
        return;
    }

    new_len = len - rem_len;
    block_nb = new_len / SHA256_BLOCK_SIZE;

    shifted_message = message + rem_len;

    sha256_transf(ctx, ctx->block, 1);
    sha256_transf(ctx, shifted_message, block_nb);

    rem_len = new_len % SHA256_BLOCK_SIZE;

    memcpy(ctx->block, &shifted_message[block_nb << 6], rem_len);

    ctx->len = rem_len;
    ctx->tot_len += (block_nb + 1) << 6;
}

int sha256_final(sha256_ctx* ctx, uint8* digest) {
    uint64 block_nb;
    uint64 pm_len;
    uint64 len_b;
    uint64 tot_len;

    block_nb = (1 + ((SHA256_BLOCK_SIZE - 9) < (ctx->len % SHA256_BLOCK_SIZE)));

    tot_len = ctx->tot_len + ctx->len;
    ctx->tot_len = tot_len;

    len_b = tot_len << 3;
    pm_len = block_nb << 6;

    memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
    ctx->block[ctx->len] = 0x80;
    UNPACK64(len_b, ctx->block + pm_len - 8);

    sha256_transf(ctx, ctx->block, block_nb);

    UNPACK32(ctx->h[0], &digest[0]);
    UNPACK32(ctx->h[1], &digest[4]);
    UNPACK32(ctx->h[2], &digest[8]);
    UNPACK32(ctx->h[3], &digest[12]);
    UNPACK32(ctx->h[4], &digest[16]);
    UNPACK32(ctx->h[5], &digest[20]);
    UNPACK32(ctx->h[6], &digest[24]);
    UNPACK32(ctx->h[7], &digest[28]);

    free(ctx);
    return SHA256_DIGEST_SIZE;
}

/* SHA-384 functions */

sha384_ctx* sha384_init(void) {
    sha384_ctx* ctx;
    ctx = malloc(sizeof(sha384_ctx));
    if (!ctx) {
        return 0;
    }

    ctx->h[0] = sha384_h0[0];
    ctx->h[1] = sha384_h0[1];
    ctx->h[2] = sha384_h0[2];
    ctx->h[3] = sha384_h0[3];
    ctx->h[4] = sha384_h0[4];
    ctx->h[5] = sha384_h0[5];
    ctx->h[6] = sha384_h0[6];
    ctx->h[7] = sha384_h0[7];

    ctx->len = 0;
    ctx->tot_len = 0;
    return ctx;
}

void sha384_update(sha384_ctx* ctx, const uint8* message, uint64 len) {
    uint64 block_nb;
    uint64 new_len, rem_len, tmp_len;
    const uint8* shifted_message;

    tmp_len = SHA384_BLOCK_SIZE - ctx->len;
    rem_len = len < tmp_len ? len : tmp_len;

    memcpy(&ctx->block[ctx->len], message, rem_len);

    if (ctx->len + len < SHA384_BLOCK_SIZE) {
        ctx->len += len;
        return;
    }

    new_len = len - rem_len;
    block_nb = new_len / SHA384_BLOCK_SIZE;

    shifted_message = message + rem_len;

    sha512_transf(ctx, ctx->block, 1);
    sha512_transf(ctx, shifted_message, block_nb);

    rem_len = new_len % SHA384_BLOCK_SIZE;

    memcpy(ctx->block, &shifted_message[block_nb << 7], rem_len);

    ctx->len = rem_len;
    ctx->tot_len += (block_nb + 1) << 7;
}

int sha384_final(sha384_ctx* ctx, uint8* digest) {
    uint64 block_nb;
    uint64 pm_len;
    uint64 len_b;
    uint64 tot_len;

    block_nb = (1 + ((SHA384_BLOCK_SIZE - 17) < (ctx->len % SHA384_BLOCK_SIZE)));

    tot_len = ctx->tot_len + ctx->len;
    ctx->tot_len = tot_len;

    len_b = tot_len << 3;
    pm_len = block_nb << 7;

    memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
    ctx->block[ctx->len] = 0x80;
    UNPACK64(len_b, ctx->block + pm_len - 8);

    sha512_transf(ctx, ctx->block, block_nb);

    UNPACK64(ctx->h[0], &digest[0]);
    UNPACK64(ctx->h[1], &digest[8]);
    UNPACK64(ctx->h[2], &digest[16]);
    UNPACK64(ctx->h[3], &digest[24]);
    UNPACK64(ctx->h[4], &digest[32]);
    UNPACK64(ctx->h[5], &digest[40]);

    free(ctx);
    return SHA384_DIGEST_SIZE;
}

/* SHA-512 functions */

sha512_ctx* sha512_init(void) {
    sha512_ctx* ctx;
    ctx = malloc(sizeof(sha512_ctx));
    if (!ctx) {
        return 0;
    }

    ctx->h[0] = sha512_h0[0];
    ctx->h[1] = sha512_h0[1];
    ctx->h[2] = sha512_h0[2];
    ctx->h[3] = sha512_h0[3];
    ctx->h[4] = sha512_h0[4];
    ctx->h[5] = sha512_h0[5];
    ctx->h[6] = sha512_h0[6];
    ctx->h[7] = sha512_h0[7];

    ctx->len = 0;
    ctx->tot_len = 0;
    return ctx;
}

void sha512_update(sha512_ctx* ctx, const uint8* message, uint64 len) {
    uint64 block_nb;
    uint64 new_len, rem_len, tmp_len;
    const uint8* shifted_message;

    tmp_len = SHA512_BLOCK_SIZE - ctx->len;
    rem_len = len < tmp_len ? len : tmp_len;

    memcpy(&ctx->block[ctx->len], message, rem_len);

    if (ctx->len + len < SHA512_BLOCK_SIZE) {
        ctx->len += len;
        return;
    }

    new_len = len - rem_len;
    block_nb = new_len / SHA512_BLOCK_SIZE;

    shifted_message = message + rem_len;

    sha512_transf(ctx, ctx->block, 1);
    sha512_transf(ctx, shifted_message, block_nb);

    rem_len = new_len % SHA512_BLOCK_SIZE;

    memcpy(ctx->block, &shifted_message[block_nb << 7], rem_len);

    ctx->len = rem_len;
    ctx->tot_len += (block_nb + 1) << 7;
}

int sha512_final(sha512_ctx* ctx, uint8* digest) {
    uint64 block_nb;
    uint64 pm_len;
    uint64 len_b;
    uint64 tot_len;

    block_nb = 1 + ((SHA512_BLOCK_SIZE - 17) < (ctx->len % SHA512_BLOCK_SIZE));

    tot_len = ctx->tot_len + ctx->len;
    ctx->tot_len = tot_len;

    len_b = tot_len << 3;
    pm_len = block_nb << 7;

    memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
    ctx->block[ctx->len] = 0x80;
    UNPACK64(len_b, ctx->block + pm_len - 8);

    sha512_transf(ctx, ctx->block, block_nb);

    UNPACK64(ctx->h[0], &digest[0]);
    UNPACK64(ctx->h[1], &digest[8]);
    UNPACK64(ctx->h[2], &digest[16]);
    UNPACK64(ctx->h[3], &digest[24]);
    UNPACK64(ctx->h[4], &digest[32]);
    UNPACK64(ctx->h[5], &digest[40]);
    UNPACK64(ctx->h[6], &digest[48]);
    UNPACK64(ctx->h[7], &digest[56]);

    free(ctx);
    return SHA512_DIGEST_SIZE;
}
